---
id: generating-types
title: "Generating Types"
slug: generating-types
---

import Tabs from '@theme/Tabs';
import TabItem from '@theme/TabItem';

Supabase will soon release native type generators that dump your database types for various languages. For now, we support TypeScript through a third-party tool.

## Usage with TypeScript

`supabase-js` ships with type definitions for usage with TypeScript and for convenient IntelliSense autocomplete and documentation in your editor.

When using TypeScript, you can pass the type of database row as a type parameter to the `from` method to get better autocompletion support down the chain. 
If you don't provide a type for the row you need to explicitly pass `from<any>('tableName')`.

```ts
type Message = {
  id: number;
  inserted_at: string;
  message: string;
  user_id: string;
  channel_id: number;
  author: { username: string };
};

const response = await supabase
  .from<Message>('messages') // Message maps to the type of the row in your database.
  .select('*, author:user_id(username)')
  .match({ channel_id: 2 }); // Your IDE will be able to help with automcompletion.
response.body // Response body will be of type Array<Message>.

// If you don't provide a type for the row you need to explicitly pass `from<any>('tableName')`.
const response = await supabase
  .from<any>('messages')
  .select('*, author:user_id(username)')
  .match({ channel_id: 2 });
response.body // Response body will be of type Array<any>.
```

### Generate database types from Swagger OpenAPI specification

Supabase generates a Swagger specification file for your database which can be used to generate your data types for usage with TypeScript.

The Swagger specification for your Supabase project can be accessed as follows:

```txt
https://your-project.supabase.co/rest/v1/?apikey=your-anon-key
```

Using the open source [swagger-to-ts](https://github.com/manifoldco/swagger-to-ts#%EF%B8%8F-reading-specs-from-remote-resource) tool you can generate your types and store them locally:

```bash
npx @manifoldco/swagger-to-ts https://your-project.supabase.co/rest/v1/?apikey=your-anon-key --output types/supabase.ts
```

**Note:** Do note that your local types won't automatically stay in sync with your database, so make sure to regenerate your types after your make changes to your database.

After you have generated your types, you can use them in your TypeScript projects:

```ts
import { NextApiRequest, NextApiResponse } from "next";
import { createClient } from "@supabase/supabase-js";
import { definitions } from "../../types/supabase";

const supabase = createClient(
  process.env.NEXT_PUBLIC_SUPABASE_URL,
  process.env.SUPABASE_SECRET_KEY
);

export default async (req: NextApiRequest, res: NextApiResponse) => {
  const allOnlineUsers = await supabase
    .from<definitions["users"]>("users")
    .select("*")
    .eq("status", "ONLINE");
  res.status(200).json(allOnlineUsers);
};
```